Q-learning 모델을 이용한 IoT 기반 주차유도 시스템의 설계 및 구현

지용주,최학희,김동성,Ji, Yong-Joo,Choi, Hak-Hui,Kim, Dong-Seong 대한임베디드공학회 2016 대한임베디드공학회논문지 Vol.11 No.3

This paper proposes an optimal dynamic resource allocation method in IoT (Internet of Things) parking guidance system using Q-learning resource allocation model. In the proposed method, a resource allocation using a forecasting model based on Q-learning is employed for optimal utilization of parking guidance system. To demonstrate efficiency and availability of the proposed method, it is verified by computer simulation and practical testbed. Through simulation results, this paper proves that the proposed method can enhance total throughput, decrease penalty fee issued by SLA (Service Level Agreement) and reduce response time with the dynamic number of users.

수중 센서 네트워크를 위한 채널 특성기반의 협력 통신 기법

지용주(Yong-Joo Ji),최학희(Hak-Hui Choi),이혜민(Hye-Min Lee),김동성(Dong-Seong Kim) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.6

본 논문은 수중 음파 센서 네트워크의 패킷 전송률을 높이고 에너지 소모량을 줄이기 위한 협력 전송 기법을 제안한다. 제안하는 기법은 각 노드에서 가상 안테나 배열이라고 부르는 분산 안테나들이 같은 패킷들을 전송하고, 수신노드에서는 수신된 패킷들을 결합하여 패킷 손실률을 낮춘다. 따라서 높은 전송 손실, 전파 지연 및 주위 잡음과 같은 수중 채널의 고유 특성을 고려한 채널 특성 기반의 협력 전송 기법은 중계노드들을 통한 높은 다이버시티 이득을 제공하여 수중 음파 센서 네트워크의 신뢰성을 향상시킨다. 또한 송신노드에서 채널 상태, 거리 비용, 각 노드 당 남은 에너지를 고려하여 이웃노드들 중에서 목적지와 중계노드를 선택하는 알고리즘을 제안한다. 모의실험 결과는 OPNET Moduler를 통해 제안된 방법의 평균 에너지 소비, 패킷 전달 비율, 응답 시간 측면에서 비-협력 기법 및 SPF(Shortest Path First) 기법보다 향상된 성능을 보여준다. This paper presents a cooperative transmission scheme for underwater acoustic sensor networks to improve packet transmission rate and reduce energy consumption. Source node transmits duplicated information relayed by distributed antennas called a virtual antenna array. Destination node combines that information to reduce packet error rate. The suggested cooperative scheme enhances the reliability by providing high diversity gains through intermediate relay nodes to overcome the distinct characteristics of the underwater channel, such as high transmission loss, propagation delay, and ambient noises. It is suggested that the algorithm select destinations and potential relays from a set of neighboring nodes that utilize distance cost, the residual energy of each node and local measurement of the channel conditions into calculation. Simulation results show that the proposed scheme reduces average energy consumption, response time, and increases packet delivery ratio compared with the SPF(Shortest Path First) and non-cooperative scheme using OPNET Moduler.

골프장 경기보조원의 직무스트레스와 업무 수행능력의 관계

지용주(Ji Yong-Joo),공성배(Kong Seong-Bae),한동진(Han Dong-Jin) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.3

The purpose of this study was to closely examine the influence of job stress for caddies' performing ability. Population was set to caddies who are working in the south Kyounggido area. Totally 210 people were selected. Through the process of classification and reference in questionnaire, 7 people were excluded whose response was insincere and was omitted. And then, totally 203 people were carried out frequency analysis, factor analysis, reliability test, t-test, one-way ANOVA, and multiple regression analysis by using program in SPSS WIN 15.0. After conducting several empirical tests, this study finds the followings. First, job stress had positively and negatively effects on caddies' performing ability. Job stress subfactor organizational relations, personal relations, job relations had negative effects on performing ability's subfactor job satisfaction but playing attitude had positive effects. In addition, organizational relations had negative effects on performing ability's subfactor manager relations and collegiality each. Organizational relations had negative effects on expertise but job relations had positive effects. Personal relations had negative effects on job performance.

생태복원사업에서의 사례를 통한 성향분석 및 활용방안 연구

지용주(Ji, Yong Joo),김용석(Kim, Yong Suk),조동길(Cho, Dong Gil),문다휘(Moon, Da Hwi) 한국측량학회 2021 한국측량학회 학술대회자료집 Vol.2021 No.11

골프 선수들의 프리 샷 루틴과 심리적 기술 및 경기력의 관계

지용주(Yong Joo Ji) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.48

The purpose of this study is to examine the relationship of a Pre-Shot Routine, Psychological Skills and Golf Performance of Korea College Golf Association Championship and to investigate closely the cause-effect relationship between variables. Frequency analysis, exploratory factor analysis, correlation analysis, and regression analysis were conducted using SPSS 15.0 program. Results revealed from these research methods and analyses of data are as follows: First, as a result of verifying difference in a pre-shot routine by demographic characteristics, there was the statistically significant difference in behavioral factors by gender, in cognitive factors by scoring average and professional certification. In psychological skills by demographic characteristics, there was the statistically significant difference in self-confidence, arousal control and anxiety by scoring average, in arousal control by the best score. In performance by demographic characteristics, there was the difference in score, putting, birdies, greens in regulation and recovery percentage by career, scoring average, the best score and professional certification. Second, A pre-shot routine had significant influences on psychological skills. A pre-shot routine had significant influences on self-confidence, on visualization, on challenge and on anxiety in the order of cognitive and behavioral routines. A cognitive pre-shot routine had not significant influences on arousal control but a behavioral routine had. Third, A pre-shot routine had not significant influences on performance. Forth, Psychological skills had significant influences on performance. Self-confidence(β=-.341) had significant influences on birdies and visualization(β=-.298) had on greens in regulation.

아마추어 골퍼들의 골프방송 시청동기와 시청만족 및 재시청 의도의 관계

지용주(Ji, Yong-Joo),공성배(Kong, Seong-Bae) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.5

This study is to examine relationship between amateurs" watching motive, satisfaction and rewatching intention on golf channel. To test this, 377 golf channel viewers over the age of 20 were sampled from driving range users living in Kyeongido Yongm city. SPSS 15.0 program was used for analyzing data. First, watching motive had positive influence on watching satisfaction subfactor external satisfaction (information seeking, entertainment pursuit, vicarious satisfaction in turn) and internal satisfaction (information seeking, entertainment pursuit in turn). Second, watching motive had positive influence on rewatching intention(information seeking, entertainment pursuit, vicarious satisfaction in turn). Third, watching satisfaction had positive influence on rewatching intention subfactor external satisfaction.

Opening-up of Light Penetrating Alleyway and Tying Down of Slanting Branches Enhanced Fruiting and Fruit Quality in a Over-crowded and Mature ‘Fuji’/MM.106/ Seedling Tree Ochard

Yong-Koo Kim(김용구),Hyun-Hee Han(한현희),Jong-Hyun Ryu(류종현),Chang-Ho Lee(이창호),Jung- Dae Jin(진정대),Sang-Jin Yang(양상진),Yong-Ju Ji(지용주),Kyu-Sang Kwon(권규상),Joo-Duk Jang(장주덕) 한국원예학회 2003 한국원예학회 학술발표요지 Vol.2003 No.5

골프 관심도가 시청만족과 수용태도에 미치는 영향

공성배(Kong Seong-Bae),지용주(Ji Yong-Joo),한동진(Han Dong-Jin) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.3

This study is to examine the effect of the concerns of golf on viewing satisfaction and an attitude of acceptance of golf channel. To test this, 377 golf channel viewers over the age of 20 were sampled from driving range users living in Kyeongido Yongin city. SPSS 15.0 program was used for analyzing data. Subjects were analyzed with exploratory factor analysis, reliability analysis, correlation analysis and multiple regression analysis. The conclusions are as follows: First, the concerns of golf channel had positive influence on the behavioral and affective concern factors in external satisfaction and on the affective, behavioral and cognitive concern factors in internal satisfaction. Second, the concerns of golf channel had positive influence on the affective concern factors in psychological attitude and on the affective and cognitive and behavioral concern factors in cognitive attitude. The concerns of golf channel had positive influence on the cognitive and affective concern factors but negative influence on behavioral concern factors in individual attitude. Third, viewing satisfaction had positive influence on external satisfaction in psychological satisfaction, on external satisfaction and internal satisfaction in cognitive attitude and on external satisfaction and internal satisfaction in individual satisfaction.

골프 관심도와 골프방송 시청형태 및 수행능력의 관계

공성배(Kong Seong-Bae),지용주(Ji Yong-Joo),한동진(Han Dong-Jin) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.4

This study is to examine relationship between golf concern, viewer’s behavior and golf performance. To test this, 377 golf channel viewers over the age of 20 were sampled from driving range users living in Kyeongido Yongin city. SPSS 15.0 program was used for analyzing data. Subjects were analyzed with frequency analysis, factor analysis, reliability analysis, correlation analysis and multiple regression analysis. The conclusions are as follows: First, golf concern’s subfactor, emotional and behavioral concern had positive influence on the watching attitude and watching action each. Second, golf concern’s subfactor, behavioral, emotional and cognitive concern had positive influence on the golf performance. Third, subfactor of viewer’s behavior, watching action had positive influence on the golf performance.

계절별 강수 패턴에 따른 하천 식생 변화 양상 연구

정희정 ( Hee-jeong Jeong ),유승연 ( Seung-yeon Yu ),조은지 ( Eun-ji Cho ),지용주 ( Yong-joo Ji ),김용석 ( Yong-suk Kim ),오현경 ( Hyun-kyung Oh ),이종성 ( Jong-sung Lee ),장현도 ( Hyun-do Jang ),조동길 ( Dong-gil Cho ) 한국지리정보학회 2023 한국지리정보학회지 Vol.26 No.2

국내에서는 모래와 자갈로 구성된 하천에서 식생이 과도하게 번성하는 현상이 전국적인 문제로 대두되고 있으며 그 요인을 봄철 강수량 감소와 연강수량 , 증가로 지적하고 있다. 본 연구는 경주시 소재 남천을 대상으로 강수 패턴 변화가 하천 식생에 미치는 영향을 파악하고 출현 식생의 면적변화, 그리고 생태적 특성 분석을 목적으로 수행되었다. 연구 결과, 남천의 여름철 월강수량은 2007년 이후로 감소하는 양상을 보였으며 사주면적 대비 식생면적은 지속적으로 증가하였다. 범람이 발생하지 않는 수준의 강수가 지속될 때 귀화식물 비율은 꾸준히 증가했으나, 귀화식물이 차지하는 면적은 적었다. 또한 일정 수위가 유지될 때, 단일종의 우점으로 인해 종다양성이 낮았으며 우점하는 종은 주로 자생식물이었다. 자생식물의 우점은 귀화식물의 생육을 억제하였으나, 식생면적은 더 크게 증가하였다. 따라서 하천식생의 활착과 번성을 해소하기 위해서는 자생식물과 귀화식물의 구분보다 식생확산 자체에 대한 관리가 필요하다. 여름철 집중 호우로 인한 고수위와 범람지속은 식물군락을 교란시켰고 이후 형성된 식생은 주로 자생식물이었다. 하천생태계에서 이와 같은 범람은 자생식물의 출현과 과도하게 형성된 식생군락에 긍정적인 요소로 작용하므로 식생 관리계획 수립 시 고려해야 할 것이다. In Korea, excessive vegetation in rivers made up of sand and gravel is emerging as a nationwide problem, which is attributed to increased spring precipitation and decreased annual precipitation. Therefore, this study was conducted for the purpose of identifying the effect of changes in precipitation patterns on river vegetation in Namcheon, Gyeongju, and analyzing the area of vegetation and ecological characteristics. As a result of the study, the amount of monthly precipitation in the summer of Namcheon decreased after 2007, and the area of vegetation increased continuously compared to the area of the sandbank. The proportion of naturalized plants increased steadily when precipitation continued to a level that did not cause flooding, but the area occupied by naturalized plants was small. Also, when the water level is maintained, the species diversity is low due to the dominance of a single species, and the dominant species was mainly native plants. Dominance of native plants inhibited the growth of naturalized plants, but the vegetation area increased even more. Therefore, it is necessary to manage the spread of vegetation itself rather than the division of native plants and naturalized plants in order to eliminate the active growth and prosperity of river vegetation. High water levels and continuous flooding caused by torrential rains in summer disturbed the plant communities, and vegetation formed afterwards was mainly native plants. Such flooding in river ecosystems is a positive factor for the emergence of native plants and over-formed vegetation communities, so it should be considered when establishing a vegetation management plan.